Petee g



(No Model.)

.P. G. BROWN.

EXTENSION LIGHT FIXTURE.

No, 358,802. Patented Mar. 1 1887.

ATTORNEY UNITED STATES PETER e. BROWN, or SCHENEOTADY, new YORK.

EXTENSION LIGHT-FIXTURE.

SPECIFICATION forming part of Letters Patent No. 358,802, dated March 1, 1887.

Application filed October 30, 1884. Serial No.146,845. (No model.)

To all whom it may concern.-

Be it known that I, PETER G. BROWN, a citizen of the United States, residing at Schenectady, in the county of Schenectady and State of New Yorl ,h-ave invented certain new and useful Improvements in Extension Light- Brackets,of which the following is a specifica tion, reference being had to the accompanying drawings.

In a patent granted to me on the 14th day of October, 1884, for an extension light-bracket I have shown and described alamp-frame supported by chains or cords wound upon the grooved periphery of a spring-drum and passing over friction-rollersjournaled upon standards projecting from the supporting bed-plate of thesaid drum. In this instance the effective power of the spring to maintain in equilibrium lamps of different weights could be. varied within large limits by decreasing or increasing the facility with which the said rollers were capable of revolving upon their pinions or shafts, the adjustment being effected by providing said shafts at one end witha slotted head and at the other with a screwth read,permitting them to be screwed a greater or less distance into the standard, a corre sponding friction being exerted by the screwheads upon the ends of the rollers.

In my present invention I have devised means, hereinafter described and claimed, for transferring this tension directly to the body of the drum, or in some instances directly to the shaft of the drum.

By means of my improvement, moreover, I am enabled to guard against a too sudden descent of the lamp when the latter is being pulled down, the tension or friction against the cylinder or its shaft tending to check rapid rotation. Moreover, upon lessening or releasing the tension during the upward progress of the lamp the springs power becomes largely increased, the cylinder or drum acting quickly to take up the slack of the chain as the lamp is lifted by the hand.

In the accompanying drawings I haveillustrated the means preferred by me in carrying out my invention.

In the several figures like letters indicate like parts.

Figure 1 represents a planview illustrating my improvement, 2. part being shown broken away to disclosethe arrangement of parts. Fig. 2 represents a side view, and Fig. 3 adetail perspective, of one of the parts.

The spring-drum, grooved or flanged, as shown, is preferably of the construction described in my former Letters Patent above referred to, and for that reason need not be minutely described herein.

A represents the'base-plate, B 0 D the three flanges within which the chain E is wound, and F the guide-rollers over which the chain passes to the lamp-frame G. These rollers are mounted upon pinions or shafts H, attached to an angle-piece, J, pivoted to the base-plate at K and having a perforation at L,into which enters the screw stop-pin M.

The angle-piece J is preferably provided upon its outer surface with a layer, Z,of wood, rubber,soft metal',or the like,to prevent wearing away of the lower flange, B, of the spring drum.

The parts being arranged as described, the operation of my invention is as follows: The screw M is screwed in a distance proportionate to the amount of pressure desired to be exerted upon the lower cylinder-flange by the bearing-surface of the angle-piece when the lamp is in place. The cords or chains being adjusted to the length desired, and the spring being brought into play, as detailed in my former patent, the lamp will :remain in equi librium at whatever point it may be located by the hand. The weight of the lamp being sustained by the rollers F, is transmitted from them to the pivoted angle-pieces J, and c011- sequently causes these latter to impinge against the lower flange, B, of the spring-drum, occasioning frictional resistance to the revolution of the said drum or cylinder upon its shaft. When the lamp is elevated by the hand to raise it to a higher position, thisfrietion is relieved,and the drum revolving immediately takes up the slack of the cords or chains. The 9 tension is, however, not so great as to prevent or seriously interfere with the lowering of the lamp at a moderate degree of speed. If, however, the lamp is suddenly pulled downward,the friction isvery largely increased I00 and acts as a check upon the movement of the cylinder,and hence upon the speed with which the chains or cords unwind.

It is evident that, without departing from the spirit of my invention,the contact between the friction-pieces and cylinder may be secured at some other point than the outer rim of the lowest flange of the latter.

I am aware that it has been heretofore proposed to conduct the cord of a spring-drum over a roller mounted upon the free end of a pivoted friction-brake, the said friction-brake being applied to the edges of the drum, and I do not claim such construction.

Having thus described my invention,what I claim, and desire to secure by Letters Patent, 1s-

1. In an extension light-bracket, the combination, with a friction-brake, of a revolving spring-drum having one of its ends parallel to and in juxtaposition to the bearing-surface of the brake,and alamp-sustaining cord or chain connected with the drum and passing over the free end of the brake, substantially as de scribed.

2. In an extension light-bracket, the combination, with a pivoted friction-brake, of a revolving spring-drum having one of its ends parallel to and in juxtaposition to the bearingsurface of the brake,a friction-roller upon the free end of the brake, and a lamp-sustaining cord or chain connected with the drum and passing over the roller, substantially as de scribed.

3. In an extension light-bracket, the combination, with apivoted friction-brake, of a revolving spring-drum, a lamp-sustaining .cord or chain connected with the drum and passing over the free end of the brake, and an adjustable stop-pin for regulating the friction, substantially as shown and described.

4. In an extension 1ight-bracket-,the coinbination,with a pivoted friction-brake, of a revolving spring-drum having one of its ends parallel to and in juxtaposition to the bearingsurface of the brake,a lamp-sustaining cord or chain connected with the drum and passing over the free end of the brake, and an adjustable stop-pin for regulating the friction, substantially as described.

5. In an extension light-bracket,the combination, with the angle-brake J, pivoted at K and perforated at L, of the revolving springdrum and its lamp-sustaining cord or chain passing over the free end of the brake, and the adjustable stop-pin M, substantially as described.

In testimony whereof I afiix my signature in presence of two witnesses.

PETER G. BROYVL WVitnesscs:

ALEX. F. VEDDER, J. E. ORCHARD. 

